The 21 happiest countries in the world

The happiest countries in the world have a lot in common — including their policies on immigration.

For the latest World Happiness Report, a yearly ranking from the United Nations that assesses a country's average well-being by looking at its income, healthy life expectancy, social support, freedom, and trust and generosity, the authors paid particular attention to migration.

"Perhaps the most striking finding of the whole report is that a ranking of countries according to the happiness of their immigrant populations is almost exactly the same as for the rest of the population," the authors of the report wrote.

19. United Kingdom — England, Scotland, Wales, and Northern Ireland remained in the same spot as last year, with social support and per capita GDP appearing to play the biggest roles in its score.

18. United States — The country dropped four places on the rankings, something the report's editors attribute to social causes like less perceived personal freedom, lower social support, and mental illness.

16. Belgium — This country ranked almost identically with Germany, with GDP and social support playing the strongest roles in its score.

15. Germany

14. Ireland — The country moved up a spot since last year's ranking, and its score is based heavily on how residents ranked their social support.

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13. Costa Rica — Out of all the countries in the top 21, Costa Rica had among the lowest GDP per capita. Nevertheless, its high levels of social support and low levels of perceived corruption earned it the same spot on the list as last year.

9. Sweden — This country moved up one place from last year, with social support, high GDP per capita, and healthy life expectancy earning it a place in the top 10.

8. New Zealand — Despite having a slightly lower GDP per capita than Australia, the two countries rank almost identically on the list in terms of all their happiness factors except generosity, with Kiwis being slightly more generous than Aussies.

7. Canada — The country retained its ranking this year, with social factors like diversity continuing to play a strong role. Canada also ranked among the top five "potential destinations" for people looking to emigrate from their current country.

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6. The Netherlands — The country and Canada have very similar happiness profiles, ranking neck-and-neck in terms of most of its happiness factors.

4. Iceland — Social support proved to be one of the most important factors considered in the rankings, and of all the nations surveyed by the Gallup World Poll, Iceland performed among the best.

3. Denmark — The country fell one place in the ranking, but retains a steady score based on all of its happiness factors.

2. Norway — Four different countries have held top spots on this list for the past three years: Switzerland, Denmark, Norway and Finland. Overall, they all continue to do very well on measures of the well-being of their migrants and their population as a whole.

1. Finland — The country rocketed from fifth to first place this year. Four other Nordic countries also stayed in the top five happiest countries on the list. "Finland is at the top of both rankings in this report, with the happiest immigrants, and the happiest population in general," the report's authors wrote.